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Home My WebLink AboutReataining wall Specs. Step 6.3 -Stepping a Wall/Another Option Another option for walls that step-up is to cut to fit a 6' wide section of a Step/Cap for the Denver or an 8' wide section of a Step/Cap for the Clifton and lay the Step/Cap vertically to finish the end. To ensure the vertical cap maintains a straight line from the face to the back of the block, a 2'chip 13 installed near the back of the block(see illustration below). StOP/CAP Block cut to s•or a- Step 7 -Capping a Curved Wall The Step/Cap is rectangular in shape and is perfect for straight walls. For radius turns,an XL cap will need to be saw cut to fit.To ensure permanent placement of the caps on top of the wall, a quality exterior concrete adhesive should be used. N Step 8•Special Applications While the installation steps presented are applicable to most basic wall designs, special consideration needs to be given to those applications in which a slope, surcharge loading and/or less than ideal soils are present.These types of applications may require geosynthetic reinforcement or other engineering design support.Such applications include but are not limited to: •Wall Height • Fences and Guardrails •Tiered Walls •Water Applications • Driveways and Roads • Bridges and Culverts • Drainage •Structures Please refer to the geogrid reinforced wall sections of this guide for more information in regard to the incorporation of geosynthetic reinforcement in wall design. Step 1 e98e Course P —U c.,aee Preparation Beginning at a point of the wall'9 I2 vun lOdd1A lowest eievatbn fw.f c.,d. down It*lengthexcavate a trench sKw A4ak n' hf;n 9 cak of the wall that r� F"Owd"WO will accommodate at least 6- of comp30e-d base material.We suggest burying 10%of your wall haOt below grade with a minimum A' Mi Of 6" Rafe FIII )1• �I' � A' NYr. (nrq�xffY1 even on short walls Ste the Thliknesf (;r wAlr*PAd trench u P Min.14afe lwcli^R VaA p or down with respect to Fill Wlnm adjacent grade.The width of the trench for both the Denver and Clifton Walls should be a minimum of LevelingPdTirrKh �"`"wr•( ' 24'.Based on the type of application my'rr�r'�„k•� and what is retained,the depth of the — leveling pad may vary.If necessary, consult with an engineer,After excavating the native soil and prior to 24' . A' min, comps adding base material,remove loose c'a^°I„ ad ci Area f.„a„ffK v.,d ti�� material from the trench 21 b' Sim. and compact. it...Fill f mck-om ALTERNATIVEAN • WEED TRIMMING Step 1 (Option 11 = -Using an Edger CxOka Add a concrete edger in front of � vEi SKW RkKk the retaining wall to act as a bolsterIlr;mTi'r against grass and weeds.Retaining �,p-.Tfr;��d aivnirfl;rip+hul wall must sit a minimum of 6" below r,n.rrnal i;o kf; di,lim. grade,Top of edger should match K,WcrUr —� top of grade. Step 1 (Option 2) -Pouring a Concrete Footing `rAnChnrw'` c pekfrk Complete all steps described in Step c"'� `��""`' I srsvRk>G 1.Then,a concrete footing should be nrsinTilc poured on top of the granular base beRcThrbaxk ff k) i};IALW I tr arY>,cfl piu a rfs;.,lwiiu,f course.This step will require concreteIF forms set in place to create the size u"n`g� footing needed. NOTE:Size of the footing as well as steel reinforcement shall be determined at the tire of engineerirg. NOTE:Remove the back lip of the retairing wall units prior to installing the first tier on the footing. Rfl.TAINING J SQ'IR are divided into throo groups: pairticios, • peat 2 Passing#200 sievo that is made up of moss, CIO"to'001T -Best for -MRY Cause settlement leaves and vegetable '""'Illingth and suppon matter, and topsoil - removedUn" Yom ft'Condition,consult a soils enginew. Should be Step 2 -Leveling Pad Installation Place a minimum of 6" of compacted base material and compact to 95% Standard Proctor density. Verify that the base is level with a transit or hand level. Be aware that the base material(commonly —` referred to as road base or base aggregate)will vary from region to region. The base material should consist of crushed material: 3/4" crushed concrete I with fines or 3/4" crushed rock or limestone with t, ` fines.Your material must be angular, nothing round. Round rock will act like ball bearings and roll when under pressure, causing the wall to bow or collapse. Step 3 -Base Course Installation The base course will consist of one layer of block. + Base units will have the rear lip removed before placing on the leveling pad. Use a string line behind the tail of the block for alignment on straight wall applications.All blocks should rest firmly on the pad and be centered to allow 6" of base material -�_,,;; ., in front and 6" behind the base block. Level each •' "' -' `vr-' block, side-to-side, front-to-back and across three full blocks with a hand level.A rubber mallet may be used to level and align the blocks. Step 4-Core and Drainage Fill Place 3/4" to 1" clean aggregate(crushed rock) within the cores and a minimum of 12" behind the blocks.This creates a drainage zone and the stone columns that help to unify and maximize the performance of the wall. In addition, sock wrapped �. perforated drainpipe can be installed at the desired level behind the wall(usually behind the first block .s above grade).The perforated drainpipe should have �.. adequate slope to drain water in the right direction towards each drainpipe outlet. Drainpipe outlets are y' usually installed every 30 to 50 ft. AETAININL WALLS 1- - Step 5 -Successive Course Installation Pnor to adding successive courses. the top of each block needs to be clean and free of foreign material. Center the block and pull it forward until the rear lip abuts the two blocks below it. Place core ' and drainage fill as in Step 4.Place the L backfill material behind the drainage rock in maximum 3' to 6' lifts based on the :, j;S► y,, rating of your compaction equipment and compact to 95% Standard Proctor Density. Repeat this process for each successive course. Large compaction or construction equipment should be kept a minimum of 3' from the back of the wall. This 3' area should be compacted with a vibratory plate compactor. Step 6.1 - Stepping a Wall �- When building your wall with the Clifton, a Corner Block in conjunction with a Step/ Cap may be used to end a course that P P• ' ste s-u 4 ,a Step 6.2 -Add Step/Caps to r Finish the Top of Your Walls I LIM G1 weo��